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Kenwood TK-373G Service Manual

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UHF FM TRANSCEIVER
TK-373G
SERVICE MANUAL
GENERAL ...................................................................... 2
SYSTEM SET-UP .......................................................... 2
OPERATING FEATURES .............................................. 3
REALIGNMENT ............................................................. 7
DISASSEMBLY FOR REPAIR ..................................... 10
CIRCUIT DESCRIPTION ............................................. 11
SEMICONDUCTOR DATA .......................................... 15
DESCRIPTION OF COMPONENTS ............................ 16
PARTS LIST ................................................................. 18
EXPLODED VIEW ....................................................... 25
PACKING ..................................................................... 26
Button knob (PTT)
(K29-5334-13)
Button knob
(MONI/LAMP)
(K29-5333-13)
CONTENTS
©
2002-1 PRINTED IN JAPAN
B51-8618-00 (S) 931
Knob (ENCODER)
(K29-5331-03)
Knob (VOLUME)
(K29-5332-03)
Cabinet assy
(A02-3568-33)
Key top (4 keys)
(K29-9142-02)
ADJUSTMENT ............................................................. 27
DISPLAY UNIT (X54-3250-11) ............................... 37
TX-RX UNIT (X57-650X-XX) .................................. 39
SCHEMATIC DIAGRAM .............................................. 45
BLOCK DIAGRAM ....................................................... 49
LEVEL DIAGRAM ........................................................ 51
KNB-14/KNB-15A (Ni-Cd BATTERY) .......................... 52
KNB-20N (Ni-MH BATTERY) ....................................... 52
SPECIFICATIONS ................................... BACK COVER

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Summary of Contents for Kenwood TK-373G

  • Page 1: Table Of Contents

    UHF FM TRANSCEIVER TK-373G SERVICE MANUAL © 2002-1 PRINTED IN JAPAN B51-8618-00 (S) 931 Knob (ENCODER) (K29-5331-03) Knob (VOLUME) (K29-5332-03) Cabinet assy (A02-3568-33) Button knob (PTT) (K29-5334-13) Button knob (MONI/LAMP) (K29-5333-13) Key top (4 keys) (K29-9142-02) CONTENTS GENERAL ..............2 ADJUSTMENT .............

  • Page 2: General

    Merchandise received License and frequency allocated by FCC Frequency range (MHz) RF power Type TX/RX 450~470 4.0W TK-373G K Choose the type of transceiver TX/RX 470~490 4.0W TK-373G K2 Transceiver programming A personal computer (IBM PC or compatible), programming interface (KPG-22), and programming software (KPG-76D) are required for programming.

  • Page 3: Operating Features

    TK-373G OPERATING FEATURES Display 1. Operating Features Antenna Speaker q q q q q w w w w w e e e e e Microphone r r r r r i i i i i t t t t t...
  • Page 4 TK-373G OPERATING FEATURES 12) RF power low 2. Programmable keys Used to temporarily switch transmission output to low power. The functions the FPU programs to the function keys are Turning the function on enables: described in the following sections. Hi Low, Low Low...
  • Page 5 TK-373G OPERATING FEATURES List type system scan the drop out delay time, the system/group is assigned as the A scan list can be set for each system. new revert system/group. The list to be scanned can be changed by changing the...

  • Page 6: Audible User Feedback Tones

    TK-373G OPERATING FEATURES PTT button is held down. The alert tone stops when the PTT to indicate that the mode has been entered. If the scan is on, it button is released. is resumed (the “SCN” mark goes on). When any repeater becomes available, a ringing tone sounds and this mode ends.

  • Page 7: Realignment

    TK-373G OPERATING FEATURES / REALIGNMENT REALIGNMENT • Alert tone 1. Modes This tone is output when the transceiver is in TX inhibition for TOT, battery warning and PLL unlocked. It is output until User mode the PTT button is released. (The 697Hz tone is output.)
  • Page 8 Fig. 1 6. Firmware Programming Mode 3. Set the firmware to be updated by file name item. 4. Hold down the [Side1] and [Side2] switches on the TK-373G, 6-1. Preface and press the power switch. Flash memory is mounted on the TK-373G. This allows the...

  • Page 9: Clone Mode

    SP/MIC connectors. The operation is as follows (the transmit radio is the master and the receive radio is the slave). 1. Turn the master TK-373G power ON with the [Side1]+[5] key held down. The TK-373G displays " CLONE ".

  • Page 10: Disassembly For Repair

    TK-373G DISASSEMBLY FOR REPAIR Separating the case assembly from the chassis. Separating the chassis from the unit. 1. Remove the two knobs and three round units 1. Remove the three screws 2. Remove the two screws Lift the unit (X54), and rise up the connecter lever in the 3.

  • Page 11: Circuit Description

    TK-373G CIRCUIT DESCRIPTION 3) IF Amplifier circuit 1. Frequency configuration The first IF signal is passed through a four-pole monolithic The receiver utilizes double conversion. The first IF is 49.95 crystal filter (XF1) to remove the adjacent channel signal. MHz and the second IF is 450 kHz. The first local oscillator The filtered first IF signal is amplified by the first IF amplifier signal is supplied form the PLL circuit.
  • Page 12 TK-373G CIRCUIT DESCRIPTION 5) Audio amplifier circuit from the phase comparator in IC2. The output signal from The demodulated signal from IC4 is amplified by IC16 (2/2), the phase comparator is filtered through a low-pass filter high-pass filtered, low-pass filtered, high-pass filtered, band- and passed to the VCO to control the oscillator eliminate filtered, and de-emphasized by IC14.

  • Page 13: Power Supply

    TK-373G CIRCUIT DESCRIPTION reference voltage from IC13, and the output of IC3(2/2) 4. Transmitter System controls the VGG of the RF power amplifier to make both 1) Microphone amplifier voltages the same. The signal from the microphone passes through the limiter...
  • Page 14 TK-373G CIRCUIT DESCRIPTION 1) Frequency shift circuit EEPROM The microprocessor (IC13) operates at a clock of Note : The EEPROM stores tuning data (Deviation, Squelch, 9.8304MHz. This oscillator has a circuit that shifts the etc.). frequency by BEAT SHIFT SW (Q31).

  • Page 15: Semiconductor Data

    TK-373G SEMICONDUCTOR DATA LCD Driver : LC75823W (Display UNIT IC501) Microprocessor : 30622M4A-410GP (TX-RX UNIT : IC13) Block diagram Pin function Port Function Name COM1 COM2 COM3 S52 S51 TX:Automatic Power Control data output DTMF DTMF BEEP output COMMON Not used LATCH &...

  • Page 16: Description Of Components

    TK-373G SEMICONDUCTOR DATA / DESCRIPTION OF COMPONENTS Port DESCRIPTION OF COMPONENTS Function Name Not used DISPLAY UNIT (X54-3250-11) 50-59 A18-A9 Flash memory address bus Ref. No. Use/Function Operation/Condition IC501 LCD driver Flash memory address bus Q501 Transistor Current driver / LCD back light LED AVR...
  • Page 17 TK-373G DESCRIPTION OF COMPONENTS Ref. No. Use/Function Operation/Condition Transistor DC switch / Squelch DC switch / 5T, Save Transistor DC switch / 5M SP Mute switch Transistor Clock frequency shift Q32~34 Transistor DC switch / SP Mute Q35(1/2) Mute switch...

  • Page 18: Parts List

    MOS IC J21-8378-04 HARDWARE FIXTURE(SPEAKER) Q501 2SB1132(Q,R) TRANSISTOR J29-0658-05 BELT HOOK J32-0925-04 HEXAGON BOSS Q502 2SC4617(S) TRANSISTOR TX-RX UNIT (X57-6500-XX) -10:TK-373G K -11:TK-373G K2 K29-5331-03 KNOB(ENCODER) K29-5332-03 KNOB(VOLUME) B30-2019-05 LED(RE/GR) K29-5333-13 BUTTON KNOB(MONI/LAMP) K29-5334-13 BUTTON KNOB(PTT) CC73HCH1H100C CHIP C 10PF...
  • Page 19 C150 CK73GB1H102K CHIP C 1000PF CC73GCH1H330G CHIP C 33PF C151-153 CK73GB1H471K CHIP C 470PF CK73GB1H471K CHIP C 470PF C155 C92-0662-05 CHIP-TAN 15UF 6.3WV CK73FB1E104K CHIP C 0.10UF C156,157 CK73GB1H471K CHIP C 470PF K : TK-373G K K2 : TK-373G K2...
  • Page 20 E40-5662-05 PIN ASSY SOCKET C232 CK73GB1H103K CHIP C 0.010UF K E11-0457-05 PHONE JACK C233 CC73GCH1H151J CHIP C 150PF C234,235 CK73GB1H272J CHIP C 2700PF F53-0130-05 FUSE F53-0217-05 FUSE C236 CK73GB1C104K CHIP C 0.10UF K : TK-373G K K2 : TK-373G K2...
  • Page 21 R90-0724-05 MULTI-COMP 1K R92-1252-05 CHIP R 0OHM J 1/16W CP2-9 R90-0741-05 MULTIPLE RESISTOR RK73GB1J563J CHIP R J 1/16W CP10 R90-0724-05 MULTI-COMP 1K CP11-18 R90-0741-05 MULTIPLE RESISTOR RN73GH1J154D CHIP R 150K D 1/16W K : TK-373G K K2 : TK-373G K2...
  • Page 22 R204 RK73GB1J273J CHIP R J 1/16W R131 RK73GB1J101J CHIP R J 1/16W R205 RK73GB1J182J CHIP R 1.8K J 1/16W R132 RK73GB1J104J CHIP R 100K J 1/16W R206 RK73GB1J471J CHIP R J 1/16W K : TK-373G K K2 : TK-373G K2...
  • Page 23 RK73GB1J124J CHIP R 120K J 1/16W Q13,14 DTA144EE DIGITAL TRANSISTOR R327 RK73GB1J393J CHIP R J 1/16W R12-7491-05 TRIMMING POT.(68K) DTC114EE DIGITAL TRANSISTOR DTA114YE DIGITAL TRANSISTOR S401 S70-0457-05 TACT SWITCH DTC144EE DIGITAL TRANSISTOR K : TK-373G K K2 : TK-373G K2...
  • Page 24 TRANSISTOR RN47A4 TRANSISTOR Q24,25 DTC114EE DIGITAL TRANSISTOR DTA114EE DIGITAL TRANSISTOR UPA572T DTA114YE DIGITAL TRANSISTOR 2SK1588 2SC4649(N,P) TRANSISTOR 2SA1362(GR) TRANSISTOR Q33,34 DTC144EE DIGITAL TRANSISTOR UPA672T 2SK1824 2SA1774(S) TRANSISTOR 2SC4617(S) TRANSISTOR 2SK1824 Q301 3SK318 K : TK-373G K K2 : TK-373G K2...

  • Page 25: Exploded View

    TK-373G EXPLODED VIEW 42 32 DISPLAY unit J32-0925-04 TX-RX unit (A/2) TX-RX unit (B/2) A M3.6x4 :N09-2319-05 B M2x3.5 :N09-2331-05 C NUT :N14-0582-14 D NUT :N14-0583-04 E M2.6x6 :N30-2606-46 F M2x3 :N39-2030-46 G M2x5 :N67-2005-46 2x4.5 :N78-2045-46 :N79-2030-46 704 : K2 only :N83-2005-46 Parts with the exploded numbers larger than 700 are not supplied.

  • Page 26: Packing

    TK-373G PACKING 28. PACKING FIXTURE (H12-1487-02) 29. PROTECTION BAG (H25-0085-04) PAMPHLET : K2 only WARRANTY CARD 38. BELT HOOK (J29-0658-05) 30. PROTECTION BAG 6. INSTRUCTION MANUAL (H25-2012-04) (B62-1576-00) 3. CAP (SP/MIC) (B09-0351-03) 35. SP/MIC HOLDER K. SCREW SET (J21-4493-04) (N99-2012-05) 28.

  • Page 27: Adjustment

    TK-373G ADJUSTMENT Test Equipment Required for Alignment Test Equipment Major Specifications Standard Signal Generator Frequency Range 450 to 470MHz (K) 470 to 490MHz (K2) (SSG) Modulation Frequency modulation and external modulation. Output -127dBm/0.1µV to greater than -47dBm/1mV Power Meter Input Impedance 50 .

  • Page 28: Test Mode

    E37-0851-05) following table. When required. re-adjust them following the adjustment procedure to obtain the frequencies you want in This cable is used for connecting the TK-373G display unit actual operation. and TX/RX unit when you test or repair the transceiver.
  • Page 29 TK-373G ADJUSTMENT LCD display (Test mode) channel No. Signalling No. Press [A], to enter tuning mode. Use the [∞] key to write tuning data through the tuning modes, and the channel selector knob to adjust the tuning requirements (1 to 256 appears on LCD).
  • Page 30 TK-373G ADJUSTMENT Tuning mode B A T T Battery warning level(Wide) H P O W Hi Power Hi Power (Low) Hi Power (Low’) Hi Power (Cen) Hi Power (Hi’) Hi Power (Hi) L P O W Low Power Low Power (Low) Low Power (Low’)
  • Page 31 TK-373G ADJUSTMENT Note Precision parts are used for the PTT, side1, and side2 switches. In order to avoid damaging these switches, do not press them using your fingers. However, if it is necessary to press these switches, be sure to press them at 90˚ angles, pressing them at other angles can easily damage the parts.
  • Page 32 TK-373G ADJUSTMENT Measurement Adjustment Specifications/ Item Condition Remark Test equipment Terminal Parts Method 6. Low Power [Panel Test Mode] Check 1) CH-Sig:1-1 Check 0.5~1.5W Set low power (Push [∞]) 1.2A or less PTT:ON 2) CH-Sig:2-1 PTT:ON 3) CH-Sig:3-1 PTT:ON 7. Max DEV...
  • Page 33 TK-373G ADJUSTMENT Measurement Adjustment Specifications/ Item Condition Remark Test equipment Terminal Parts Method 13.QT Deviation 1) Adj item [FQT] Power meter Encoder Wide:0.85kHz ±40Hz Adjust Adjust [ Dev meter SP/MIC connector knob Narrow:0.40kHz ±40Hz [Wide] LPF:3kHz Oscilloscope HPF:OFF 2) Adj item...
  • Page 34 TK-373G ADJUSTMENT Measurement Adjustment Specifications/ Item Condition Remark Test equipment Terminal Parts Method K type 1. BPF (PANEL TEST MODE) Tracking generator TC301, TC302, Adjust wave form to figure 1. Adjustment CH-Sig 1-1 Spectrum analyzer TC303 Tra-G setting -40dBm Fig. 1 2.
  • Page 35 TK-373G ADJUSTMENT Measurement Adjustment Specifications/ Item Condition Remark Test equipment Terminal Parts Method K2 type 1. BPF (PANEL TEST MODE) Tracking generator TC301, TC302, Adjust wave form to figure 1. Adjustment CH-Sig 1-1 Spectrum analyzer TC303 Tra-G setting -40dBm Fig. 1 2.
  • Page 36 TK-373G ADJUSTMENT Adjustment points TX-RX unit (X57-650) Component side view Foil Side View TC301 TC303 TC302 Battery terminal IC12 IC14 TC1 : Transmit lock voltage adjustment VR1 : Frequency adjustment TC2 : Receive lock voltage adjustment TC301 : TC302 :...

  • Page 37: Pc Board Views

    TK-373G PC BOARD VIEW DISPLAY UNIT (X54-3250-11) Component Side View (J72-0663-02) DISPLAY UNIT (X54-3250-11) Foil Side View (J72-0663-02) DISPLAY UNIT (X54-3250-11) DISPLAY UNIT (X54-3250-11) Foil Side View Component Side View R518 R518 R513 R513 IC501 IC501 C515 C515 Q502 Q502...

  • Page 38: Tx-Rx Unit (X57-650X-Xx)

    TK-373G PC BOARD VIEW TX-RX UNIT (X57-650X-XX) Component Side View (J72-0811-02) 0-10:TK-373G K 0-11:TK-373G K2 TX-RX UNIT (X57-650X-XX) Component Side View C100 R241 R203 R235 R249 R260 C180 R172 C185 R233 R177 R180 R250 C255 CP20 R198 R234 R126 R222...
  • Page 39 TK-373G PC BOARD VIEW TX-RX UNIT (X57-650X-XX) Foil Side View (J72-0811-02) 0-10:TK-373G K 0-11:TK-373G K2 TX-RX UNIT (X57-650X-XX) Foil Side View C122 C142 C121 C156 R275 R272 R273 R271 C113 C152 C334 R115 C333 C336 C120 C140 C157 C163 C164...
  • Page 40 TK-373G PC BOARD VIEW TX-RX UNIT (X57-650X-XX) Component Side + Foil Side View TX-RX UNIT (X57-650X-XX) Component Side View + Foil Side View (J72-0811-02) 0-10:TK-373G K 0-11:TK-373G K2 C100 C142 C122 C121 C156 R275 R241 R203 R235 C180 R249 R273...

  • Page 41: Schematic Diagram

    TK-373G SCHEMATIC DIAGRAM • Note) Component marked with a dot ( ) are Parts of pattern 1.

  • Page 42: Block Diagram

    TK-373G TK-373G BLOCK DIAGRAM...

  • Page 43: Level Diagram

    TK-373G TK-373G KNB-14/KNB-15A (Ni-Cd BATTERY) / KNB-20N (Ni-MH BATTERY) LEVEL DIAGRAM KNB-14 SCHEMATIC DIAGRAM SPECIFICATIONS Voltage : 7.2V (1.2V x 6) Capacity : 600mAh Dimensions : 60.8W x 110.8H x 17.3D (mm) Discharge pin side (projections included) Charger and charging time:...

  • Page 44: Kmc-17/Kmc-21 (Speaker Microphone)

    TK-373G KMC-17/KMC-21 (SPEAKER MICROPHONE) KMC-17 (Speaker microphone) KMC-17 Parts List Ref. No. Parts No. Description parts marks A02-0907-08 Case (Front) A02-0908-08 Case (Rear) B09-0316-08 D10-0606-08 Lever (PTT) E11-0421-05 Phone jack E30-3138-08 Curl cord F07-0889-08 Silicon rubber (PTT) G53-0569-08 Packing (MIC case)

  • Page 45: Specifications

    13, Boulevard Ney, 75018 Paris, France Sales Marketing Division KENWOOD ELECTRONICS U.K. LIMITED 1 Ang Mo Kio Street 63, Singapore 569110 KENWOOD House, Dwight Road, Watford, Herts., WD1 8EB United Kingdom KENWOOD ELECTRONICS EUROPE B.V. Amsterdamseweg 37, 1422 AC Uithoorn, The Netherlands...

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